Sealing Shower Wall Cavities with Great Stuff Wide Spray (2025)
We’re all familiar with Great Stuff. We’ve all seen the kind with the straw—there’s low expansion, there’s big expansion. This one is different from all of those products in that your application is from a decent distance. This is Greater Stuff.
They should have taken that branding opportunity for DuPont—Greater Stuff.
Packaging and preparation
It comes in two-packs, and in each pack you get nozzle tips. The product itself needs to be shaken, not stirred. (Martinis should be stirred and not shaken, just in case anyone was confused. They’re two totally different things.)
Safety first: wear long sleeves and gloves. Shake the can for about a minute. It’s a single-part foam, and shaking mixes the propellant in with the foam so you don’t just shoot propellant into the air.
Application setup
We used this product yesterday to air seal and insulate an exterior wall that a tub or shower will go behind. There are a bunch of ways to do this—you could buy a froth pack and spray foam, or cut pieces of rigid insulation. We used styrofoam and Greater Stuff because that’s what we had on hand.
Rather than cutting a nice, tight friction fit, I cut the foam myself—so it’s not pretty. But it will illustrate how much greater this stuff is than regular Great Stuff.
Shake it for a full minute. It’s a red can. You can spray as close as 8 inches or as far as 20 inches from the surface.
Nozzle options
There are two different tips: a cone tip and a fan tip. The fan tip sprays wide, and it’s adjustable. You can make it vertical, horizontal, or diagonal—whatever you need. It gives you a broad application.
So first we’ll use the cone tip along the edge, and then switch to the fan tip to show how wide it can spray.
Demonstration at different distances
Would you like to see how it looks at different distances, or just the right way to do it? Let’s show the distances. I’ll start closer than I normally would so you can see, then move farther away so you see how it expands. In real-world use, I recommend testing it first.
- At 8 inches: here’s what it looks like.
- At 12 inches: here’s the coverage.
- At 20 inches: you can see the foam expands more, which would make it hard to install that shower later—you’d have to scrape it off.
Control and cleanup
Pretty decent. Now I’ll swap out my tips. You’ll notice the control is tight. We’ve been using this product for a few months on job sites, and honestly, it impressed us. We expected it to be messy, but the control of the tips is amazing.
The foam goes where you put it. I don’t have it all over me or my hands. I do have long sleeves on, but still—very clean application.
Using the fan tip
Now I’ll show you the fan tip across the surface. It’s great for sealing. You’ll typically use it for spot applications, but imagine you’re in an attic: can lights, penetrations, wires, plumbing pipes. You can walk around and spray each one quickly.
I’ll spray a little more foam here. Do whatever you want with it—it’s versatile. And finally, we want to thank DuPont for being a sponsor.